4.0L Engine Swap

Boatwrench

Parts Collector
NAXJA Member
My 00XJ engine has lost oil pressure and sounds like broken glass. I can get a 2005 4.0 engine with 30K miles and was wondering if the bell housing & motor mount bosses are the same or will some custom work need to occur?

Thanks,
Tom
 

Tim_MN

Freakish Hand Strength
NAXJA Member
Hey Tom,

TJ/WJ 4.0L Engine blocks underwent clean sheet design changes effective in the 1999 WJ Grand and 2000 TJ Wrangler. These re-designed WJ/TJ engine blocks are not bolt on interchangeable with XJ/ZJ blocks. The motor mount bolt holes and belt driven accessory mounting bolt holes are in different locations, or not present at all, TJ/WJ vs. XJ/ZJ. It is possible to drill and tap the necessary holes and to adapt the motor mount brackets. If I recall correctly, somebody, probably BrownDog, makes motor mounts that will do the job.

Any 1990-2001 XJ Cherokee or 1993-98 ZJ Grand Cherokee 4.0 L engine block will interchange. 1997-1999 4.0L TJ Wrangler blocks will also fit in XJ/ZJ. 87-95 YJ engine blocks will probably also fit.

Remove and re-use as needed or required: Intake/Exhaust manifolds, flex plate, cylinder head, distributor-less ignition or distributor assembly, fan belt driven accessories, sensors. If your donor engine has a distributor, the distributor can be removed and a distributor-less ignition assembly can be installed in it place.

If you have a cracked 0331 head, buy a good used redesigned and more durable TUPY 0331 head from a 2002+ 4.0L TJ Wrangler or WJ Grand Cherokee.
 
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Boatwrench

Parts Collector
NAXJA Member
Thanks Tim for the very informative answer. I searched the FAQ for this type of info, maybe it should be there?
 
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